im sure someone who is looking at it knows what it means, otherwise they shouldnt be touching it
And now you know why plumbers shouldn't do electrics and vice versa! fortunately I employ both.
From an eleyricians point of view I am appalled at this thread, if this had been talking about doing something with a gas boiler croppie would have shut down pages ago.
Multi-core signalling cable is in stock at any good electrical wholesaler. Never use a single insulated (i.e. non in T&E) as anything other than as the cpc - if you don't know what that is , it's precisely why you shouldn't use it, and if you do then you'll know why you shouldn't use it.